USB Recognizing Connection, not Device

Hello all,
After a recent Apple Software Update parts of my HD are corrupt, and my computer suffered a nasty drop the other day, but I really like my computer and want to use this one as long as I can before I have to get a new one.
Now, I don't know whether the update or the drop caused this to happen, but neither of my USB ports are functional. In my System Profiler it shows the USB as connected to a device (camera, printer, or external HD), but the device does not mount so I cannot print, download pictures, or use a powered USB HD. All devices mount and work correctly on other computers.
Any ideas?
Thank you,
Nicole

I reset the PMU to no avail. I know the PMU was reset- followed instructions and then was notified my date was changed. I still have the System Profiler showing connection, but connection and mounting not occurring. Anything else you can suggest doing?
The computer is not under warranty anymore. I'm comfortable opening my laptop up (did it before to diagnose a problem) and my boyfriend has his own company building high end electronics, so we could fix any solder problems that might be the problem. I'll wait for your response before we get the screwdriver and soldering iron out!
Thank you very, very much. I know I might have to get a new computer to get 100% functionality, but I just really like my PowerBook, and don't really need anything fancier for what I do computing-wise. Thanks for trying to help me keep it working!

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USB Recognizing Connection, not Device

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